New symmetric and asymmetric supercapacitors based on high surface area porous nickel and activated carbon
New symmetric and asymmetric supercapacitors based on high surface area porous nickel and activated carbon
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DOI：
10.1016/j.jpowsour.2005.10.090
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发表时间：
2006-08-25
影响因子：
9.2
通讯作者：
Lakshminarayanan, V.
中科院分区：
文献类型：
--
作者：
Ganesh, V.;Pitchumani, S.;Lakshminarayanan, V.
我们研究了一些基于高比表面积镍和镍氧化物材料的超级电容器电池组件。研究了以活性碳为负极的镍和氧化镍的对称和不对称构型。多孔镍的单电极比电容值为473Fg(-1)。我们用循环伏安法(CV)、电化学阻抗谱(EIS)和充放电曲线分析对超级电容器电池组件进行了表征。在复电容和复功率阻抗数据分析的基础上，计算了不同超级电容器电池组件的驰豫时间常数。快速的响应时间(毫秒量级)，以及在相对较高功率下的快速能量传递，表明这些材料可以在短时间脉冲器件中找到应用。对于所研究的超级电容器电池组件，库仑效率为0.93-0.99。由于气孔提供的电阻和电池制造方法产生的接触电阻的贡献，测得的等效串联电阻(ESR)值相对较高。虽然比电容值相对较小，但电池表现出快速的响应时间，这在某些特定的应用中是一个理想的特性。(C)2005 Elsevier B.V.保留所有权利。
We have studied some supercapacitor cell assemblies based on high surface area nickel and nickel oxide materials. Both symmetric and asymmetric configurations consisting of nickel and nickel oxide with activated carbon as a negative electrode have been investigated. A single electrode specific capacitance value of 473 F g(-1) of nickel is obtained for the porous nickel. We have used cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge profile analysis to characterize the supercapacitor cell assemblies. Based on the analysis of impedance data in terms of complex capacitance and complex power, the relaxation time constant (TO) was calculated for different supercapacitor cell assemblies. The quick response time (of the order of milliseconds) with fast energy delivery at relatively high power suggests that these materials can find applications in short time pulse devices. A coulombic efficiency of 0.93-0.99 is obtained for the supercapacitor cell assemblies studied in this work. The measured equivalent series resistance (ESR) value is relatively high due to the contribution from the resistance offered by the pores and the contact resistance arising from the cell fabrication method. Although the specific capacitance values are relatively less, the cell exhibits a fast response time, which is a desirable property in certain specialized applications. (c) 2005 Elsevier B.V. All rights reserved.